The stock tire size for a 2013 Honda Civic Si is 235/40R18 on 18-inch wheels, and this size is used on both the sedan and coupe variants of that model year.
Stock tire size and wheel specs
Below are the essential specs that come with the factory tire setup for the 2013 Civic Si:
- Tire size: 235/40R18
- Wheel size: 18-inch diameter, typically 18x8.0 inches
- Front and rear tires: same size on the Si for that year
These specifications reflect the factory configuration for U.S. market Civics Si in 2013. If your car has aftermarket wheels or a different trim, sizes may vary. Always confirm the exact size on the door jamb placard or in the owner's manual.
How to verify the correct size on your car
To confirm the tire size for your specific vehicle, check the driver’s door jamb sticker, which lists the original equipment tire size. The owner's manual can also confirm the standard size. If you’ve changed wheels or tires after purchase, the size may differ from the factory specification, so verify before purchasing replacements.
Summary
In short, a 2013 Honda Civic Si is equipped with 235/40R18 tires on 18-inch wheels, with the same size used on both the sedan and coupe. When replacing tires, always verify the exact size on your car’s door jamb label and consider any aftermarket wheel changes that could affect sizing.